Dr. X is studying how anger is related to happiness. His operational definition for anger is how often a person's eyebrows draw or come closer together within a 24-hour period. Is this an operational definition?

No. It is not an operational definition.

Explanation:

As the definition for anger mentioned above about the eyebrows is not an operational definition as the eyebrows can come closer or move away in other emotions as well.

Operational definition : Anger is an emotion which is associated with the hostility and aggression where a person shows their displeasure or rage.

Since anger is an intense emotional state it may cause harm to the other people, when one acts aggressively because of frustration.

A man cursing and screaming at his brother is an example of someone displaying anger.